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STOCK OPTIONS - SUMMARY OF STOCK OPTIONS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares) 3,752,209 3,131,447
Granted (in shares) 1,728,000 810,762
Exercised (in shares) (176,750) (36,250)
Cancelled and forfeited (in shares) (443,302) (153,750)
Outstanding, end of period (in shares) 4,860,157 3,752,209
Exercisable, end of period (in shares) 2,627,722  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding, beginning of period (in dollars per share) $ 3.04 $ 3.38
Granted (in dollars per share) 3.09 1.87
Exercised (in dollars per share) 2.41 3.62
Cancelled and forfeited (in dollars per share) 3.95 3.69
Outstanding, end of period (in dollars per share) 3.00 $ 3.04
Exercisable, end of period (in dollars per share) $ 3.46